Bifurcation\instability forms of high speed railway vehicles

Dong, Hao; Zeng, Jing; Xie, Jin; Lu, Jianjiang

doi:10.1007/s11431-013-5254-x

Cited by 27 publications

(15 citation statements)

References 21 publications

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“…. , do (4) c o m p u t et h eK L D (1, ) between the 1st and the th Gaussian component; (5) end for (6) find index min that minimize (1, ); where…”

Section: Gaussian Components Reductionmentioning

confidence: 99%

“…Recently, the random finite set (RFS) based Bayesian framework has been proved to be unified elegant approach for multisensor multiobject estimation [2], other than the traditional Joint Probabilistic Data Association (JPDA) [3] and Multiple Hypothesis Tracking (MHT) [4] methods in the tracking area [5]. The Probability Hypothesis Density (PHD) filter [6], Cardinalized PHD (CPHD) filter [7], and multi-Bernoulli filter [8] were established for multitarget state estimation by avoiding data association, which are incapable of track maintenance.…”

Section: Introductionmentioning

confidence: 99%

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Efficient Approximation of the Labeled Multi‐Bernoulli Filter for Online Multitarget Tracking

Wang

Xue

2017

Mathematical Problems in Engineering

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Online tracking time-varying number of targets is a challenging issue due to measurement noise, target birth or death, and association uncertainty, especially when target number is large. In this paper, we propose an efficient approximation of the Labeled Multi-Bernoulli (LMB) filter to perform online multitarget state estimation and track maintenance efficiently. On the basis of the original LMB filer, we propose a target posterior approximation technique to use a weighted single Gaussian component representing each individual target. Moreover, we present the Gaussian mixture implementation of the proposed efficient approximation of the LMB filter under linear, Gaussian assumptions on the target dynamic model and measurement model. Numerical results verify that our proposed efficient approximation of the LMB filer achieves accurate tracking performance and runs several times faster than the original LMB filer.

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“…. , do (4) c o m p u t et h eK L D (1, ) between the 1st and the th Gaussian component; (5) end for (6) find index min that minimize (1, ); where…”

Section: Gaussian Components Reductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Efficient Approximation of the Labeled Multi‐Bernoulli Filter for Online Multitarget Tracking

Wang

Xue

2017

Mathematical Problems in Engineering

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“…Moreover, the methods of eigenvalue analysis and shooting method are also an usual way to obtain limit cycle and bifurcation diagram. Zeng (1996) and Dong et al (2013) obtained the bifurcation diagrams of vehicle system by this way, what's more, Dong et al (2013) performed a widely analysis on bifurcation characteristic of the China Railway High-speed (CRH) vehicles. In addition, Zboinski and Dusza (2006, 2008, 2010 conducted a series of studies about non-linear stability on a curved track.…”

Section: Introductionmentioning

confidence: 99%

Hunting stability of high-speed railway vehicles on a curved track considering the effects of steady aerodynamic loads

Zeng

Jiang

et al. 2016

Journal of Vibration and Control

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Aerodynamic loads may have effects on the hunting stability, and the factor of curved track makes it more complicated. Therefore, considering the steady aerodynamic loads generated by crosswind and airflow in the opposite advancing direction of train, the hunting stability of high-speed railway vehicle on a curved track is studied in this paper. The changes of gravitational restoring force and creep coefficients which are caused by aerodynamic loads are considered, and the change of equilibrium position due to aerodynamic loads, centrifugal force and the factor of curved track is also in consideration. A mathematical model of a high-speed railway vehicle during curve negotiation with aerodynamic loads is set up. A program based on the model is written and verified. Using this program, the linear critical speed considering the effects of aerodynamic loads is determined by the eigenvalue analysis. This paper investigates the critical speeds in three aerodynamic conditions. Considering the aerodynamic loads, the dependence of critical speed on curve radius and superelevation is analyzed, and the impact of aerodynamic loads on instability mode is analyzed as well. In addition, this paper obtains the dominant factors affecting critical speed and the variation tendency of critical speed with primary longitudinal stiffness by orthogonal experiments. The results show that the critical speed decreases or increases while the wind is blowing to outer rail or inner rail respectively. The aerodynamic loads produce obvious effects on the instability mode. The variation tendency of critical speed dependence on curve radius in the conditions with aerodynamic loads keeps consistent with the case without aerodynamic loads. It is seen from the orthogonal experiments that, aerodynamic loads and curve radius are the dominant factors affecting linear critical speed of vehicle on a curved track, and the linear critical speed decreases with the increasing of primary longitudinal stiffness.

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“…Di Gialleonardo, Braghin and Bruni [24] investigated the influence of different rail models (rigid model, simplified sectional model and Finite element model) on bifurcation diagram. Zeng [25] and Dong et al [26] obtained the bifurcation diagrams of vehicle system by the shooting method. Dong et al [26] performed a widely analysis on bifurcation characteristic of the CRH vehicles.…”

Section: Introductionmentioning

confidence: 99%

“…Zeng [25] and Dong et al [26] obtained the bifurcation diagrams of vehicle system by the shooting method. Dong et al [26] performed a widely analysis on bifurcation characteristic of the CRH vehicles. The studies mentioned above are connected with a vehicle running along a straight track.…”

Section: Introductionmentioning

confidence: 99%

Influences of aerodynamic loads on hunting stability of high-speed railway vehicles and parameter studies

Zeng

Jiang

et al. 2014

Acta Mech Sin

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The influences of steady aerodynamic loads on hunting stability of high-speed railway vehicles were investigated in this study. A mechanism is suggested to explain the change of hunting behavior due to actions of aerodynamic loads: the aerodynamic loads can change the position of vehicle system (consequently the contact relations), the wheel/rail normal contact forces, the gravitational restoring forces/moments and the creep forces/moments. A mathematical model for hunting stability incorporating such influences was developed. A computer program capable of incorporating the effects of aerodynamic loads based on the model was written, and the critical speeds were calculated using this program. The dependences of linear and nonlinear critical speeds on suspension parameters considering aerodynamic loads were analyzed by using the orthogonal test method, the results were also compared with the situations without aerodynamic loads. It is shown that the most dominant factors affecting linear and nonlinear critical speeds are different whether the aerodynamic loads considered or not. The damping of yaw damper is the most dominant influencing factor for linear critical speeds, while the damping of lateral damper is most dominant for nonlinear ones. When the influences of aerodynamic loads are considered, the linear critical speeds decrease with the rise of cross wind velocity, whereas it is not the case for the nonlinear critical speeds. The variation trends of critical speeds with suspension parameters can be significantly changed by aerodynamic loads. Combined actions of aerodynamic loads and suspension parameters also affect the critical speeds. The effects of such joint action are more obvious for nonlinear critical speeds.

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Bifurcation\instability forms of high speed railway vehicles

Cited by 27 publications

References 21 publications

Efficient Approximation of the Labeled Multi‐Bernoulli Filter for Online Multitarget Tracking

Efficient Approximation of the Labeled Multi‐Bernoulli Filter for Online Multitarget Tracking

Hunting stability of high-speed railway vehicles on a curved track considering the effects of steady aerodynamic loads

Influences of aerodynamic loads on hunting stability of high-speed railway vehicles and parameter studies

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